|
|
|
|
|
|
|
At present we have no further information about the SRT-93.
If you can provide more details or a photograph, please contact us.
New information will be added to this page as and when it becomes available.
In the meantime, check out the
other members of the SRS-91 family here.
|
|
|
The SRT-93 was developed around the same time as the
SRT-90
and SRT-91,
which is why the CIA ordered the manufacturer of the
SRR-90 receiver – the NRP –
to develop a set of plug-in modules to make the receiver compatible
with it.
➤ More information
|
|
|
In order to reduce the chance of discovery, professional bugs often feature
a special technique known as audio masking. The SRT-93 features a
popular FM-based subcarrier audio masking scheme, in which a frequency
modulated (FM) subcarrier is frequency modulated onto an RF carrier, whilst
at the same time injecting random noise into the unit's baseband signal.
➤ More about subcarrier (SC) audio masking
|
Despite the fact that the SRT-93 uses a sophisticated audio masking scheme,
it is relatively easy to discover. First of all it transmits a continuous
wave (CW) signal, which will exhaust the battery after several hours of use.
Secondly, a professional bug-tracer of the era, such as the ScanLock Mark VB,
can detect and demodulate its signal within seconds.
➤ More about the ScanLock
|
|
|
- SRT-93R, technial manual (incomplete)
Date and author unknown. Retrieved March 2017.
|
|
|
|
Any links shown in red are currently unavailable.
If you like the information on this website, why not make a donation?
© Crypto Museum. Created: Thursday 09 March 2017. Last changed: Tuesday, 12 July 2022 - 09:11 CET.
|
 |
|
|
|
